Sure! Here's the requested content in spun format with synonyms:
Candy is crazy about Fred and also Foster.
Candy has strong feelings for Fred, and also Frank.
Phineas captures the love of Cathy, and also Felix.
Candace being with Phineas and Ferb.
Finn means the world to Candace, and Felix.
Cathy is emotionally attached to both Phineas and Ferb.
I hope you find these
variations helpful!